Product Description The Shimano TL-CN42 Chain Wear Indicator measures the wear of your chain. The Shimano TL-CN42 chain wear indicator is a gauge that allows you to determine the level of wear of a chain accurately, easily and quickly. Laser cut and 3-pin design ensure maximum precision. TL-CN42 is made of heat-hardened steel. Specifications: Function: measuring tool Tool Type: gauge Technical Information: Material: stainless steel Features: high precision via laser cutting unique 3-pin design allows accurate measurement heat-treated Note from the manufacturer: A worn chain does not reach the original Shimano shifting performance and wears sprockets and chainrings faster. Manufacturer Number: Y-12160000 Contents: 1 x Shimano TL-CN42 chain checker Manufacturer: Shimano Europe B.V. High Tech Campus 92 5656 AG Eindhoven Netherlands info@shimano-eu.com